private List <LootTableDrop> RollFromTableInternal(LootTableData table)
{
LootTableEntryData entry = RollForEntry(table);
List <LootTableDrop> drops = RollForDrop(entry);
List <LootTableDrop> unprocessedDrops = new List <LootTableDrop>();
List <LootTableDrop> finalDrops = new List <LootTableDrop>();
while (drops.Count > 0)
{
for (int i = drops.Count - 1; i >= 0; i--)
{
// Check if the drop is a table
LootTableDrop drop = drops[i];
if (drop.Type == LootTableDrop.DropType.TABLE)
{
// first remove the drop, add results list to tableDrops
drops.RemoveAt(i);
// Add new drops to the unprocessed drops list
unprocessedDrops.AddRange(RollFromTable(drop.ItemId));
}
else
{
finalDrops.Add(drop);
}
}
// Things that we've found need to be processed
drops = new List <LootTableDrop>(unprocessedDrops);
unprocessedDrops.Clear();
}
return(finalDrops);
}
private LootTableEntryData RollForEntry(LootTableData table)
{
List <LootTableEntryData> entries = table.Entries;
LootTableEntryData entry = null;
// sum up the weights
float totalWeight = 0f;
for (int i = 0, count = entries.Count; i < count; i++)
{
totalWeight += entries[i].Weight;
}
// Roll a random value from 0 to totalWeight and pick the first item that brings rollingTotalWeight above totalweight
float roll = UnityEngine.Random.Range(0, totalWeight);
float rollingTotalWeight = 0f;
for (int i = 0, count = entries.Count; i < count; i++)
{
rollingTotalWeight += entries[i].Weight;
if (roll <= rollingTotalWeight)
{
entry = entries[i];
break;
}
}
return(entry);
}
private List <LootTableDrop> RollForDrop(LootTableEntryData entry)
{
List <LootTableDrop> possibleDrops = entry.Drops;
List <LootTableDrop> drops = new List <LootTableDrop>();
// Check the style of the entry
// If the drop style is to pick one of the drops, do a simple weighted roll
if (entry.Style == LootTableEntryData.DropStyle.ONE_OF)
{
// sum up the weights
float totalWeight = 0f;
for (int i = 0, count = possibleDrops.Count; i < count; i++)
{
totalWeight += possibleDrops[i].Weight;
}
// Roll a random value from 0 to totalWeight and pick the first item that brings rollingTotalWeight above totalweight
float roll = UnityEngine.Random.Range(0, totalWeight);
float rollingTotalWeight = 0f;
for (int i = 0, count = possibleDrops.Count; i < count; i++)
{
LootTableDrop drop = possibleDrops[i];
rollingTotalWeight += drop.Weight;
if (roll <= rollingTotalWeight)
{
// +1 because range for ints is max exlusive
drop.Amount = UnityEngine.Random.Range(drop.AmountMin, drop.AmountMax + 1);
drops.Add(drop);
break;
}
}
}
else if (entry.Style == LootTableEntryData.DropStyle.ANY_OF)
{
// We want to roll a dice for each drop, the weights of an ANY_OF are treated as a percentage
for (int i = 0, count = possibleDrops.Count; i < count; i++)
{
float roll = UnityEngine.Random.Range(0f, 1f);
LootTableDrop drop = possibleDrops[i];
if (roll <= drop.Weight)
{
// +1 because range for ints is max exlusive
drop.Amount = UnityEngine.Random.Range(drop.AmountMin, drop.AmountMax + 1);
drops.Add(drop);
}
}
}
return(drops);
}
